<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS动画效果</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.0/css/all.min.css" integrity="sha512-DxV+EoADOkOygM4IR9yXP8Sb2qwgidEmeqAEmDKIOfPRQZOWbXCzLC6vjbZyy0vPisbH2SyW27+ddLVCN+OMzQ==" crossorigin="anonymous" referrerpolicy="no-referrer" />
    <link rel="stylesheet" href="index.css">
</head>
<body>
    <div class="container">
        <div class="ring"></div>
        <div class="ring"></div>
        <div class="ring"></div>
    </div>
</body>
</html>